Spanlens MCP

Name: Spanlens MCP
Author: spanlens

by spanlensversion 0.3.0i★ 13 (Stars for the whole repo)iRuns on your computer

Registry nameio.github.spanlens/mcp-server

How to install

What it does

Query Spanlens LLM observability from Cursor, Claude Desktop, or Continue via MCP.

Connects Runs on your computer
Account or key Needs SPANLENS_API_KEY
Category Search & AI memory

Install

Pick the AI app you use, then copy the settings.

Passed 2/2 checks · Runs on your computer

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

You need a Spanlens MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a Spanlens MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

{
  "mcpServers": {
    "spanlens": {
      "command": "npx",
      "args": [
        "-y",
        "@spanlens/mcp-server"
      ],
      "env": {
        "SPANLENS_API_KEY": "your-value",
        "SPANLENS_BASE_URL": "your-value"
      }
    }
  }
}

Paste the key only into the app’s field, never into a chat or to anyone

Done

Quit Claude and open it again
Done
Try it
Use Spanlens MCP and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Spanlens MCP or shows a Spanlens MCP tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect Spanlens MCP yet

Spanlens MCP runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect Spanlens MCP

Steps for Claude →You need a Spanlens MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →You need a Spanlens MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)
Steps for Cursor →You need a Spanlens MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)
Steps for VS Code →You need a Spanlens MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

B · Others in Search & AI memory that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Context7✓ ChatGPT
AIHOT✓ ChatGPT
Sui Knowledge Base (kapa.ai)✓ ChatGPT

Works with Claude Code, with some setup first

You need a Spanlens MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a Spanlens MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done
4
Paste this command and press Enter
```
claude mcp add --scope user spanlens --env SPANLENS_API_KEY=your-value --env SPANLENS_BASE_URL=your-value -- npx -y @spanlens/mcp-server
```
Replace “your-value” with your key before pressing Enter
Paste the key only into the app’s field, never into a chat or to anyone
Done
Type /mcp in Claude Code
You should see Spanlens MCP listed as connected
Done
Try it
Use Spanlens MCP and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Spanlens MCP or shows a Spanlens MCP tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

You need a Spanlens MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a Spanlens MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Fill in your key
In the Spanlens MCP settings, SPANLENS_API_KEY, SPANLENS_BASE_URL is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Spanlens MCP and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Spanlens MCP or shows a Spanlens MCP tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

You need a Spanlens MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a Spanlens MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Fill in your key
In the Spanlens MCP settings, SPANLENS_API_KEY, SPANLENS_BASE_URL is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Spanlens MCP and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Spanlens MCP or shows a Spanlens MCP tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use Spanlens MCP💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user spanlens --env SPANLENS_API_KEY=your-value --env SPANLENS_BASE_URL=your-value -- npx -y @spanlens/mcp-server

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "spanlens": {
      "command": "npx",
      "args": [
        "-y",
        "@spanlens/mcp-server"
      ],
      "env": {
        "SPANLENS_API_KEY": "your-value",
        "SPANLENS_BASE_URL": "your-value"
      }
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "spanlens": {
      "command": "npx",
      "args": [
        "-y",
        "@spanlens/mcp-server"
      ],
      "env": {
        "SPANLENS_API_KEY": "your-value",
        "SPANLENS_BASE_URL": "your-value"
      }
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "spanlens": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@spanlens/mcp-server"
      ],
      "env": {
        "SPANLENS_API_KEY": "your-value",
        "SPANLENS_BASE_URL": "your-value"
      }
    }
  }
}

Values you fill in

SPANLENS_API_KEY secret required env
Spanlens API key. Must be a scope=public key (sl_live_pub_*) issued from the Public Keys card at https://spanlens.io/projects — the server refuses to start with a full-access sl_live_* key.
SPANLENS_BASE_URL env
Override the API endpoint for self-hosted Spanlens. Default: https://api.spanlens.io

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: 13 (Stars for the whole repo)
This repo holds several MCP listings; its stars count once in rankings
Downloads per weeki: 59/wk
Licence i: No licence stated
Connection: Runs on your computer
Transport: stdio
Latest versioni: 0.3.0
Categoryi: Search & AI memory
Published to registryi: Sep 28, 2026
Code last changedi: Nov 9, 2026
Maker: spanlens
Packages: npm: @spanlens/mcp-server
Repo: spanlens/Spanlens
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 12, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account spanlens, which owns the repo
✓ Pass
Still maintained
Code last changed 3 days ago
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Search & AI memoryi

More stars than 85% of the other 5998 servers in this category
Published to the registry more recently than 46% of the other 5998 servers in this category
Basic checks equal to or better than 100% of the other 5998 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Spanlens MCP safe?

It passed 2 of 2 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: SPANLENS_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed 3 days ago, and the latest version (0.3.0) reached the registry last month.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Context7, Codebase Memory, Ruflo

Others in the same category

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Context7

Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.

by upstashWidely used↓ 1.2M/wk★ 64.6KUpdated today

Computer or cloud

Install

Codebase Memory

Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.

by DeusDataWidely used↓ 16.8K/wk★ 48.5KUpdated 26 days ago

Runs on your computer

Install

Ruflo

Agent teams, swarms, memory and hooks for Claude Code and Codex, served over MCP.

by ruvnetWidely used↓ 74.3K/wk★ 81.5K Stars for the whole repoUpdated yesterday

Runs on your computer

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

@spanlens/mcp-server

Query your LLM observability data from inside Cursor, Continue, or Claude Desktop. Powered by Spanlens.

Ask your IDE's agent things like _"what's my OpenAI spend this week?"_, _"any cost anomalies?"_, or _"show me the most expensive trace today"_ — and get real answers from your Spanlens workspace through the Model Context Protocol.

30-second setup

1. Issue a public-scope Spanlens key

Public-scope keys (sl_live_pub_*) are read-only — they can query your dashboard data but cannot trigger LLM proxy spend. This server refuses to start with a full-access key because the credential will live in a plaintext config file in your IDE.

Create one at [spanlens.io/projects](https://spanlens.io/projects) → the Public Keys card at the top → + New public key. Copy the sl_live_pub_… value when it's shown.

2. Add the server to your IDE

Cursor — ~/.cursor/mcp.json (or workspace .cursor/mcp.json )

"mcpServers": { "spanlens": { "command": "npx", "args": ["-y", "@spanlens/mcp-server"], "env": { "SPANLENS_API_KEY": "sl_live_pub_..." } } } }

Claude Desktop — ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows)

"mcpServers": { "spanlens": { "command": "npx", "args": ["-y", "@spanlens/mcp-server"], "env": { "SPANLENS_API_KEY": "sl_live_pub_..." } } } }

Continue — ~/.continue/config.yaml

mcpServers:

name: spanlens command: npx args: ['-y', '@spanlens/mcp-server'] env: SPANLENS_API_KEY: sl_live_pub_...

3. Reload your IDE and start asking

The agent will discover seven tools and use them automatically when relevant.

What you can ask

Question	Tool called
"How much have we spent on LLMs this week?"	`get_stats`
"Break down cost by model for the last 30 days"	`get_stats(groupBy=model)`
"Which provider is costing us the most this week?"	`get_stats(groupBy=provider)`
"Any cost or latency anomalies?"	`get_anomalies`
"Show me the 10 most recent error calls on gpt-4o"	`query_requests`
"List my recent agent runs"	`list_traces`
"Walk me through trace `abc123…`"	`get_trace`
"What models could we swap to save money?"	`get_savings`
"Which end-user is driving the most spend?"	`get_user_analytics`

Available tools

Tool	What it returns
`get_stats`	Aggregate cost, request count, token usage, latency, error rate. Optional `groupBy` for a breakdown of cost, requests, latency and error rate: `model` returns one row per provider and model pair, and `provider` rolls those rows up into one row per provider, with latency and error rate weighted by request count.
`query_requests`	Individual LLM requests with cost, latency, model, error message. Filter by `model`, `provider`, `status`, `userId`, `since`, `limit`.
`list_traces`	Agent trace summaries (name, status, duration, span count, total tokens, total cost) for discovering trace IDs. Filter by `limit`, `status`, `since`, `query`. Pair with `get_trace` for the full span tree.
`get_trace`	Full agent span tree for a trace ID — every LLM/tool/retrieval span with timing, tokens, cost.
`get_anomalies`	Cost / latency / error-rate anomalies the platform has detected. Optional `since` (observation window) and `sigma` (sensitivity).
`get_savings`	Model-swap recommendations with projected monthly savings and adoption status.
`get_user_analytics`	Per-end-user usage breakdown — total cost, request count, models touched, recent calls.

Safety

This server is designed for the IDE-config use case, where the credential sits in a plaintext file that's easy to leak (dotfile sync, screen shares, accidental commits). Two defenses:

Public-scope keys only. The server boots, calls /api/v1/me/key-info against your workspace, and verifies the key has scope=public. If you accidentally paste a full-access sl_live_* key, the server refuses to start with a clear error pointing at the correct key type.
Read-only at the API layer. Even if a public key leaks, it cannot call /proxy/* or /ingest/* — the Spanlens server enforces this with a 403 + PUBLIC_KEY_WRITE_FORBIDDEN code. The blast radius of a leak is "competitor sees my usage stats", not "competitor runs up my OpenAI bill".

Configuration

Environment variable	Default	Notes
`SPANLENS_API_KEY`	_required_	A `sl_live_pub_` key from the Public Keys* card on `/projects`. The server refuses to start without one, and refuses to start with a `sl_live_*` (full) key.
`SPANLENS_BASE_URL`	`https://api.spanlens.io`	Override for self-hosted Spanlens. Trailing slashes are normalised.
`SPANLENS_TIMEOUT_MS`	`30000`	How long each API call may take, in milliseconds, before it fails with a timeout error. Applies to the startup key check and to every tool call. Accepts a whole number from 1 to 600000. Any other value stops the server at startup with an error that names the variable.

Self-hosted Spanlens

"mcpServers": { "spanlens": { "command": "npx", "args": ["-y", "@spanlens/mcp-server"], "env": { "SPANLENS_API_KEY": "sl_live_pub_...", "SPANLENS_BASE_URL": "https://spanlens.your-company.com" } } } }

License

MIT — see LICENSE in the repo root.

Spanlens MCP

What it does

Install

Install Node.js

Sign up and create a Spanlens MCP key

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js

Sign up and create a Spanlens MCP key

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js

Sign up and create a Spanlens MCP key

Click this button to open Cursor

Fill in your key

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js

Sign up and create a Spanlens MCP key

Click this button to open VS Code

Fill in your key

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

Values you fill in

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Search & AI memoryi

Common questions

Others in the same category

Context7

Codebase Memory

Ruflo

README from the maker

@spanlens/mcp-server

30-second setup

1. Issue a public-scope Spanlens key

2. Add the server to your IDE

3. Reload your IDE and start asking

What you can ask

Available tools

Safety

Configuration

Self-hosted Spanlens

Links

License